Plural of cointer; multiple people who enter into something together or who share a mutual interest.
From co- (together) + inter + -s (plural marker). The plural form of cointer, following standard English pluralization.
The rarity of this word shows how language evolves—we had 'cointers' centuries ago, but now we prefer 'co-participants' or just 'people entering together,' showing how English simplifies archaic compound terms.
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